The auto channel mode is bugged and changes to the most congested channel instead of the least congested.
Download and install InSSider on a wifi enabled PC. Run it to see which channels are most in use locally.
Decide which looks to be the most uncongested and then manually change the superhub to that channel. Only swap between 1 - 6 - 11.
If that doesn't help then, as already suggested in post#2, acquire a proper router and install it with the superhub in modem mode.